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Münster 1999 – scientific programme

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O: Oberflächenphysik

O 11: Poster (I)

O 11.4: Poster

Monday, March 22, 1999, 19:30–22:30, Aula

APPLICATION OF LOW ENERGY (e,2e) SPECTROSCOPY FOR STUDYING OXYGEN ADSORPTION ON W(001) — •S. Samarin1, J. Berakdar1, H. Schwabe1, O. Artamonov2, and J. Kirschner11MAX-Planck-Institut f"ur Mikrostrukturphysik, Weinberg 2, D-06120 Halle/S. — 2Research Institute of Physics, St.Petersburg University, Uljanovskaja 1, Petrodvoretz, 198904 St. Petersburg, Russia.

We applied the low energy (e,2e) spectroscopy in reflection-mode

scattering geometry for studying ordered oxygen adsorption on

W(001). Primary electrons with the energy of 36 eV were used to

excite the correlated electron pairs from a p(2x1) adsorbed

oxygen layer. The (e,2e) spectra of clean and oxygen covered

W(001) surface were analyzed. It was found that the adsorption

of 1 ML of oxygen on W(001) leads to the appearance of an

additional structure in the energy distribution of correlated

pairs. This structure corresponds to the excitation of electrons

from the energy level located at 6.7± 0.5 eV below the Fermi

level. This result is consistent with the UPS study of the oxygen

adsorption on W(001) [1] where the adsorbate photoemission peak

was observed at 6.5 eV below Fermi level. Taking into account

the electron-pairs diffraction from the oxygen superlattice we

explain the main structure in the electron energy sharing

distribution.

[1] A.M. Bradshaw, D. Menzel, and M. Steinkilberg. Japan. J. Appl. Phys. Suppl.2, Pt.2 (1974), 841-846.

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